Route /filename/[commit-sha] will display specific revision of a file. Resolves #892.

lib/gollum/app.rb

@@ -402,6 +402,8 @@ module Precious
         @content = page.formatted_data
         @version = version
         mustache :page
+      elsif file = wikip.wiki.file("#{file_path}", version, true)
+        show_file(file)
       else
         halt 404
       end
@@ -472,16 +474,21 @@ module Precious
 
         mustache :page
       elsif file = wiki.file(fullpath, wiki.ref, true)
+        show_file(file)
+      else
+        page_path = [path, name].compact.join('/')
+        redirect to("/create/#{clean_url(encodeURIComponent(page_path))}")
+      end
+    end
+
+    def show_file(file)
+      return unless file
       if file.on_disk?
         send_file file.on_disk_path, :disposition => 'inline'
       else
         content_type file.mime_type
         file.raw_data
       end
-      else
-        page_path = [path, name].compact.join('/')
-        redirect to("/create/#{clean_url(encodeURIComponent(page_path))}")
-      end
     end
 
     def update_wiki_page(wiki, page, content, commit, name = nil, format = nil)

test/helper.rb

@@ -87,3 +87,14 @@ def context(*args, &block)
 end
 
 $contexts = []
+
+# Commit file to wiki, overwriting previous versions of that file
+def commit_test_file(wiki, dir, filename, ext, content)
+  committer = Gollum::Committer.new(wiki, :message => "Added testfile", :parent  => wiki.repo.head.commit)
+  committer.add_to_index(dir, filename, ext, content, true)
+    committer.after_commit do |committer, sha|
+      wiki.clear_cache
+      committer.update_working_dir(dir, filename, ext)
+    end
+  committer.commit
+end

test/test_app.rb

@@ -542,6 +542,19 @@ context "Frontend" do
     assert_match /meta name="robots" content="noindex, nofollow"/, last_response.body
   end
 
+  test "show revision of specific file" do
+    shas = {}
+      ["First revision of testfile", "Second revision of testfile"].each do |content|
+        new_commit = commit_test_file(@wiki, "revisions", "testfile", "log", content)
+        shas[new_commit] = content
+      end
+      shas.each do |sha, content|
+        get "revisions/testfile.log/#{sha}"
+        assert last_response.ok?
+        assert_match /#{content}/, last_response.body
+      end
+  end
+
   def app
     Precious::App
   end